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Experimental Model to Evaluate Resolution of Pneumonia
Published on: February 17, 2023
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Estradiol resolves pneumonia via ERβ in regulatory T cells
JCI Insight
|December 8, 2020
Summary
Estradiol (E2) enhances the resolution of pneumonia-induced acute lung injury (PNA-ALI) by boosting regulatory T cells (Tregs) via ERβ signaling. This suggests E2 as a potential therapy for PNA-ALI, particularly in males.
Area of Science:
- Immunology
- Endocrinology
- Pulmonology
Background:
- Pneumonia-induced acute lung injury (PNA-ALI) has high mortality, necessitating novel therapeutic targets beyond pathogen-focused treatments.
- Sex differences in PNA survival suggest a role for sex hormones, with males exhibiting higher mortality.
- Regulatory T cells (Tregs) are crucial for resolving lung injury, and their function may be modulated by estradiol (E2).
Purpose of the Study:
- To investigate the role of estradiol (E2) in sex-based differences in pneumonia resolution.
- To determine if E2 enhances Treg function and promotes PNA-ALI resolution.
- To elucidate the specific estrogen receptor (ER) pathway involved in E2's effects on Tregs.
Main Methods:
- Utilized a mouse model of severe pneumococcal pneumonia.
- Administered systemic E2 to male mice and evaluated PNA resolution.
- Depleted Tregs (Foxp3DTR mice) and performed adoptive transfer of E2-treated Tregs.
- Assessed Treg phenotype (Foxp3, CD25, GATA3 expression) and macrophage inflammatory responses.
- Investigated the roles of ERα and ERβ signaling.
Main Results:
- Female mice showed enhanced PNA resolution with less lung inflammation and more Tregs compared to males.
- E2 administration promoted PNA resolution in male mice, independent of bacterial clearance.
- E2 upregulated Treg markers (Foxp3, CD25, GATA3) via ERβ signaling.
- Therapeutic effects of E2 were abolished in Treg-depleted mice.
- Adoptive transfer of E2-treated Tregs rescued PNA-ALI, requiring Treg ERβ expression.
- E2/ERβ signaling in Tregs was essential for controlling macrophage proinflammatory responses.
Conclusions:
- Estradiol (E2) promotes the resolution of pneumonia-induced acute lung injury (PNA-ALI) by enhancing regulatory T cell (Treg) function.
- The therapeutic effects of E2 are mediated through the ERβ receptor on Tregs.
- E2/ERβ signaling in Tregs is critical for resolving lung inflammation and controlling macrophage responses in PNA-ALI.
- E2 represents a potential therapeutic strategy for PNA-ALI, particularly for improving outcomes in males.
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